BRIEF-GAIN CAPITAL ANNOUNCES MONTHLY METRICS FOR SEPTEMBER 2017 By: Reuters: Company News October 05, 2017 at 08:44 AM EDT * GAIN CAPITAL HOLDINGS INC - SEPT 2017 RETAIL SEGMENT OTC TRADING VOLUME OF $202.6 BILLION VERSUS $237.7 BILLION IN AUG 2017 Read More >> Related Stocks: Gain Capital Holdings